littlmak,
Be careful what you read on the Errornet...
True, the reputation of the Express guns has suffered somewhat of late for various reasons. People have a prejudice against change, any change. People, especially 'gun people,' tend to prefer metal to plastic, machined to molded. But there is a certain amount of exaggeration among those who complain the loudest about the quality of 870 Express guns. I wonder how many of those who type so freely about 870 Expresses don't own one, or haven't had problems with the one they do own. I wonder just how many can tell a MIM extractor from a machined one by looking at it.
I've been shooting 870s for going on 40 years, and have yet to buy a new one. I have several Express guns of different ages and 'generations,' from an early one with walnut furniture to newer ones. I have yet to break a part on any of them or to have trouble with rust on any of them. The only 870 barrel that has offered me extraction problems came from one of the vaunted Police guns, and those extraction problems only manifest themselves with one brand of shell (fix: shoot something else).
My constant advice to anyone who feels comfortable shopping for a used gun is to buy a used 870- an older Express, Wingmaster or Police trade-in. It's axiomatic that 870s wear in, not out. Unless you "need" a new one and can only afford an Express gun, there's no reason not to give a home to one of the many good used 870s available. Like so much else, it is a matter of knowing what you're comfortable doing. There's nothing essentially wrong with current production Express guns, but older used 870s in good shape are often better bargains- if you know how to select one that fits your needs. If not, buy new.
hth,
lpl/nc